Remove any
loose debris from surface.
Run tub full
of warm water and mild detergent as hand dishwashing liquid or laundry
detergent; soak for 1/2 to 1 hour; drain and rub surface with sponge, rag,
or non-abrasive applicator; rinse thoroughly.
If grease,
oil, tar stains:
Spray with home laundering spray pre-wash;
rub lightly with sponge or non-abrasive applicator; rinse.
If ceramic
adhesives or paints:
Follow solvent methods above under "tough
stains".